@article{oai:soar-ir.repo.nii.ac.jp:00012973, author = {吉田, 俊彌 and 三井, 康司}, journal = {信州大学工学部紀要}, month = {Dec}, note = {In designing a bridge frame, the structural rigidity is examined for the constituent systems separetly, and the results of numerical calculations about each systems are simply added together and used for the estimation of required dimensions of members. Although this convensional procedure greatly facilitates the calculations, it does not determine the actual combined stresses exactly. Furthermore, to obtain the horizontal stability for the lateral loads, the lateral systems such as lateral bracing or sway bracing are attached to the main structure, and consequently the practical design, the fabrication process and the erection plan become very complicated. In this paper, the authors intend to show the properties of the grid frame with diagonal members which gives high rigidity to the bridge by omitting any lateral systems. To this, the authors discuss about the structural rigidity of bridge floor systems for the vertical or horizontal loads by proceeding theoretical analyses and experimental investigation. The rigidity of the floor structure for the vertical loads is studied by regarding this structure as a grid frame. As for the solution of the grid frame, the three-dimensional analysis which is proposed by one of us is used. On the other hand, the rigidity for the horizontal loads are investigated by treating the floor frame as a truss or a trussed beam on multiple supports. In the result, the grid frames with diagonal members have very high rigidity for vertical loads as well as for horizontal loads, therefore they may be effectively employed as the bridge floor systems., Article, 信州大学工学部紀要 33: 131-162 (1972)}, pages = {131--162}, title = {橋床の剛性に関する一考察}, volume = {33}, year = {1972} }